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Szymon Jakubczaka0efaec2014-02-14 17:09:43 -05001/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
Sreeram Ramachandran72604072014-05-21 13:19:43 -070017#ifndef NETD_SERVER_NETWORK_CONTROLLER_H
18#define NETD_SERVER_NETWORK_CONTROLLER_H
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050019
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070020#include "NetdConstants.h"
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070021#include "Permission.h"
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070022
Sreeram Ramachandran72604072014-05-21 13:19:43 -070023#include "utils/RWLock.h"
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070024
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050025#include <list>
26#include <map>
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070027#include <sys/types.h>
Sreeram Ramachandran72604072014-05-21 13:19:43 -070028#include <vector>
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050029
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070030class Network;
31class PhysicalNetwork;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070032
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050033/*
34 * Keeps track of default, per-pid, and per-uid-range network selection, as
35 * well as the mark associated with each network. Networks are identified
36 * by netid. In all set* commands netid == 0 means "unspecified" and is
37 * equivalent to clearing the mapping.
38 */
39class NetworkController {
40public:
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070041 NetworkController();
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050042
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050043 unsigned getDefaultNetwork() const;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070044 int setDefaultNetwork(unsigned netId) WARN_UNUSED_RESULT;
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050045
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070046 bool setNetworkForUidRange(uid_t uidStart, uid_t uidEnd, unsigned netId, bool forwardDns);
47 bool clearNetworkForUidRange(uid_t uidStart, uid_t uidEnd, unsigned netId);
48
49 // Order of preference: UID-specific, requestedNetId, default.
50 // Specify NETID_UNSET for requestedNetId if the default network is preferred.
51 // forDns indicates if we're querying the netId for a DNS request. This avoids sending DNS
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050052 // requests to VPNs without DNS servers.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070053 unsigned getNetwork(uid_t uid, unsigned requestedNetId, bool forDns) const;
Sreeram Ramachandran72604072014-05-21 13:19:43 -070054 unsigned getNetworkId(const char* interface) const;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070055 bool isValidNetwork(unsigned netId) const;
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050056
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070057 int createNetwork(unsigned netId, Permission permission) WARN_UNUSED_RESULT;
58 int destroyNetwork(unsigned netId) WARN_UNUSED_RESULT;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070059
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070060 int addInterfaceToNetwork(unsigned netId, const char* interface) WARN_UNUSED_RESULT;
61 int removeInterfaceFromNetwork(unsigned netId, const char* interface) WARN_UNUSED_RESULT;
62
63 Permission getPermissionForUser(uid_t uid) const;
64 void setPermissionForUsers(Permission permission, const std::vector<uid_t>& uids);
65 bool isUserPermittedOnNetwork(uid_t uid, unsigned netId) const;
66 int setPermissionForNetworks(Permission permission,
67 const std::vector<unsigned>& netIds) WARN_UNUSED_RESULT;
Sreeram Ramachandran379bd332014-04-10 19:58:06 -070068
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -070069 // Routes are added to tables determined by the interface, so only |interface| is actually used.
70 // |netId| is given only to sanity check that the interface has the correct netId.
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +090071 int addRoute(unsigned netId, const char* interface, const char* destination,
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070072 const char* nexthop, bool legacy, uid_t uid) WARN_UNUSED_RESULT;
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +090073 int removeRoute(unsigned netId, const char* interface, const char* destination,
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070074 const char* nexthop, bool legacy, uid_t uid) WARN_UNUSED_RESULT;
Sreeram Ramachandran72604072014-05-21 13:19:43 -070075
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050076private:
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070077 Network* getNetworkLocked(unsigned netId) const;
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -070078
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +090079 int modifyRoute(unsigned netId, const char* interface, const char* destination,
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070080 const char* nexthop, bool add, bool legacy, uid_t uid) WARN_UNUSED_RESULT;
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -070081
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050082 struct UidEntry {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070083 const uid_t uidStart;
84 const uid_t uidEnd;
85 const unsigned netId;
86 bool forwardDns;
87
88 UidEntry(uid_t uidStart, uid_t uidEnd, unsigned netId, bool forwardDns);
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050089 };
90
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070091 // mRWLock guards all accesses to mUidMap, mDefaultNetId, mPhysicalNetworks and mUsers.
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050092 mutable android::RWLock mRWLock;
93 std::list<UidEntry> mUidMap;
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050094 unsigned mDefaultNetId;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070095 std::map<unsigned, PhysicalNetwork*> mPhysicalNetworks; // Map keys are NetIds.
96 std::map<uid_t, Permission> mUsers;
Szymon Jakubczaka0efaec2014-02-14 17:09:43 -050097};
98
Sreeram Ramachandran72604072014-05-21 13:19:43 -070099#endif // NETD_SERVER_NETWORK_CONTROLLER_H